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TPS54325 - 3A Step-Down SWIFT™ Converter


4.5V to 18V Input, Synchronous Step-Down SWIFT™ Converter with D-CAP2™ Mode - Now Available at Digi-Key

Texas Instruments' TPS54325 is a 3-A synchronous step-down DC/DC converter that employs an easy to use adaptive on-time (D-CAP2™ mode) architecture enabling a fast transient response time without compensation components. The device is designed for use with low cost output capacitors, such as aluminum electrolytic capacitors or a 22µF low ESR ceramic output capacitor. It operates from 4.5V to 18V VCC input, and from a 2.0V to 18V power stage supply voltage. The output voltage can be programmed between 0.76V and 5.5V with a voltage divider. The device features an adjustable soft-start, enable, power good output.    TPS54325 Datasheet
Texas Instruments TPS54325 - 3A Synchronous Step Down SWIFT™ Converter

  • Overview
  • Features & Applications
  • Diagram
  • Buy Now


Overview

Why was this product developed?
Newer ASICs, even in consumer electronics applications, have more stringent load demands with faster slew rates. The power supply needs to react quickly to large changes in processor activity and current demands while keeping core voltage overshoots and undershoots at a minimum. The TPS54325 with the D-CAP2™ mode allows a fast transient response time with less ripple; while using a small amount of ceramic capacitance that keeps cost down.


Features
  • Fast Adaptive On-Time (D-CAP2™) Control Architecture
  • Integrated 120mΩ High-Side and 70mΩ Low-Side MOSFETs
  • Fixed 700kHz Switching Frequency
  • Adjustable Soft-Start Time
  • Power Good and Enable Pins
  • High Performance with 2x22µF Ceramic Cout
      –   Faster than 20µs transient response time (0-3A step)
      –   Less than 10mVp-p output voltage ripple
      –   No compensation components needed
  • 90% Efficiency at 3A; Optimized for Low Vout
  • Allows 50% Smaller Inductor Value than 350 kHz
  • Reduces Inrush Currents During Startup
  • Easily Implement Sequencing Schemes

Applications
  • Digital TV
  • High Definition Blue-ray Disc™ Player
  • Networking Home Terminal
  • Digital Set Top Box

RoHS Compliant


Diagram

Texas Instruments TPS54325 Functional Block Diagram


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 TPS54325PWPR is available in Tape & Reel (-2-ND), Cut Tape (-1-ND), and custom Digi-Reel® (-6-ND)
Texas Instruments
Part Number
Digi-Key
Part Number
Voltage
Input
Voltage
Output
Current
Output
Power
Output
Package/Case
TPS54325PWPR
2 ~ 18V
0.76 ~ 5.5V
3A
2.25W
14-TSSOP Exposed Pad, 14-eTSSOP 14-HTSSOP